I'm not trying to make a case that Macs are inferior. A Nissan is a much crappier car than a BMW, but I would bet on the crappier Nissan to run much longer without need of serious maintenance.
One thing I learned is japanese cars function very well if you change their oil very frequently. It's usually 10k miles by the book, but also the book says if you sit in traffic a lot or go short trips this should be more frequent, even as often as 3-5k miles. Most people don't read this fine print and get surprised their car burns 2 quarts of oil per thousand miles by 40k miles.
You know what would help? Data! Your car analogy is backed by decades of that being available from a slew of organizations.
Computers are harder to get that for, especially when you have to correct for things like whether different classes of buyer have notably different habits.
